1.01 Capability: A. 3” minimum diameter spherical solid passage. 1.02 Materials of Construction: A. Casing - cast iron A48 Class 35C or 40 B. All Exposed Bolts & Nuts - 316 stainless steel C. Pump Exterior Coating - Factory applied primer and finish coat to suit pumped media. D. Pump Interior & Base Elbow Interior Coating – All internal wetted parts including volute assembly, shall receive a ceramic-epoxy coating as per below. 1. Belzona®1321 (Ceramic S -Metal) (Minimum 24 dry mils thickness) shall be applied blue topcoat and gray basecoat (to ensure successful overlap) by brush, applicator, or spray at a typical thickness of 15 mils per coat. The first coat shall not be left more than 24 hours before overcoating with the second coat. Evidence of basecoat shall not be identifiable upon completion. E. Shaft & Sleeve - Stainless steel AISI 431 or 420 F. Impeller - Hard Iron (ASTM A-532 (Alloy 111A) 25% chrome cast iron. And shall have hard iron wear ring or wear plate with equal hardness to the impeller. The impeller shall not be a Vortex style. G. O-Rings - Viton H. Upper Bearing - Single row deep groove ball bearing. I. Lower Bearing - Two row angular contact ball bearing. J. All mating surfaces where watertight sealing is required shall be machined and fitted with Viton rubber O-rings. Fitting shall be such that sealing is accomplished by metal-to-metal contact between machine surfaces. This will result in controlled compression of nitrile rubber O-ring without requirement of a specific torque limit.
